A glucose metabolism disease characterized by chronic hyperglycaemia with disturbances of carbohydrate, fat and protein metabolism resulting from defects in insulin secretion, insulin action, or both. [ url:https://en.wikipedia.org/wiki/Diabetes_mellitus url:http://www.who.int/diabetes/action_online/basics/en/ url:http://www.ncbi.nlm.nih.gov/pubmed/?term=9686693 ]